Coated sheet cutting method and apparatus

a coating sheet and cutting method technology, applied in the direction of shearing apparatus, metal working apparatus, manufacturing tools, etc., can solve the problems of deteriorating shear-cut quality, cracks and/or flaws in the coating layer, and it is more difficult to select appropriate cutting conditions for shear-cutting coated sheets, etc., to achieve the effect of reducing the amount of press-bending of the coated sheet during shear-cutting, preventing the production of a large stress, and reducing the stress of the coating sh

Active Publication Date: 2010-02-02
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007]In view of the foregoing, it is an object of the invention to provide a method and apparatus for cutting a coated sheet, wherein the possible formation of cracks and flaws in a coating layer during shear-cutting the coated sheet is suppressed, whereby the deterioration of shear-cut quality can be prevented.
[0014]The coated sheet may be a recording sheet for inkjet printing. The recording sheet for inkjet printing may be constituted by a substrate such as a paper sheet, a film, or a resin coated sheet; and a coating layer which is layered on the substrate. The coating layer is filled with fine particles, for example, mainly composed of silica, which are held together by a resin binder such as poly vinyl alcohol. Especially, a gloss photo paper sheet for inkjet printing contains a smaller amount of binder which holds together fine particles such as silica in order to enhance the ink absorbency of the sheet. Thus it has a nature that the connection between fine particles is easily broken by an external force such as bending.
[0016]According to the first method and apparatus for cutting a coated sheet, when the coated sheet is subjected to shear-cutting, a contact start position where contact between the coated sheet and the upper cutting blade starts is positioned in a region which is located upstream in the feed direction of the coated sheet but outside a contacting area in the coated sheet where the coated sheet contacts with the periphery of the lower cutting blade. Thus, only the upper cutting blade can make a cut-in in the coating layer before the coating layer is passed through and subjected to shear-cutting between the upper and lower cutting blades. This contributes to suppressing the production of a large stress that could cause cracks and flaws in the coating layer during shear-cutting, whereby the deterioration of shear-cut quality can be prevented.
[0017]According to the second method and apparatus for cutting a coated sheet, when the coated sheet is subjected to shear-cutting, a contact start position where contact between the coated sheet and the upper cutting blade starts is positioned within a contacting area where the coated sheet contacts with the periphery of the lower cutting blade, and the overlap amount of between a part of the upper cutting blade and a part of the lower cutting blades is maintained to be not more than 1.5 mm during shear-cutting. As a result, the amount of press-bending that the coated sheet undergoes during shear-cutting by the upper cutting blade can be reduced, and in turn the partial deformation of the coated sheet can be decreased. This contributes to suppress possible formation of cracks and flaws in a coating layer during shear-cutting, whereby the deterioration of shear-cut quality can be prevented.

Problems solved by technology

However, as a variety of materials have been used upon request for manufacturing coated sheets in various manners, it becomes more difficult to select appropriate cutting conditions for shear-cutting the coated sheet while pulling out the coated sheet wound in a roll form, in the feed direction.
If the cutting conditions are not properly selected, there arises a problem that cracks and / or flaws may be produced in the coating layer near the cut edges of the sheet.
Especially, when the coating layer is hard and fragile, the aforementioned cracks and / or flaws could be conspicuously produced in the coating layer.

Method used

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  • Coated sheet cutting method and apparatus
  • Coated sheet cutting method and apparatus
  • Coated sheet cutting method and apparatus

Examples

Experimental program
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first embodiment

[0029]Hereinafter, the present invention will be described in detail with reference to the drawings.

[0030]A coated sheet cutting apparatus shown in FIG. 1 comprises a disk-shaped lower cutting blade 10, a lower-blade rotating motor 15 for rotating the lower cutting blade 10, a disk-shaped upper cutting blade 20 disposed opposite the lower cutting blade 10, an upper-blade rotating motor 25 for rotating the upper cutting blade 20, and a feed section 40 for feeding a long coated sheet 30.

[0031]As shown in FIGS. 2 and 3, the coated sheet 30 is manufactured by layering a coating layer 31, in which silica-based fine particles are held together by a resin binder such as polyvinyl alcohol, onto a substrate 32 which is, for example, resin-coated paper or the like. This coated sheet 30 is unwound from the sheet roll 35 which is a web wound in a roll form. The coated sheet 30 mentioned above is a recording sheet for inkjet printing. Besides the resin-coated paper, conventional paper, film and ...

second embodiment

[0068]The coated sheet 30 is clamped between the two rollers 44A and 44B of the sheet pullout roller 44, and unwound from the sheet roll 35 for feeding. The coated sheet 30 is delivered via the pass rolls 42A to 43D and passed through the nip between the lower cutting blade 10 rotating under the drive of the lower-blade rotating motor 15 and the upper cutting blade 20 rotating under the drive of the upper-blade rotating motor 25, where the coated sheet 30 is cut by the rotating lower and upper cutting blade 10, 20 in the sheet feed direction (in the direction shown by arrow H in FIG. 1). In the coated sheet cutting apparatus of the second embodiment, when shear-cutting the coated sheet 30, a contact start position P1 where the coated sheet and the upper cutting blade 20 start contacting is disposed, as shown in FIG. 10, within a contacting area R1 where the coated sheet contacts with the periphery 12 of the lower cutting blade 10. Then, the coated sheet 30 is subjected to shear-cutt...

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Abstract

A discoid lower blade and a discoid upper blade, having a sharper knife angle compared with that of the lower blade, are arranged such that rotational axes thereof are parallel to each other, and portions of the blades overlap one another in the direction that the rotational axes extend. A sheet with a coating layer on one side is fed through and shear-cut between the upper and lower blades in the direction perpendicular to the rotational axes, with the surface of the sheet opposite the coating layer in contact with a periphery of the lower blade while the blades are rotated. When the sheet is shear-cut, a contact start position, where contact between the sheet and the upper blade starts, is positioned upstream in the feed direction of the sheet but outside a contacting area of the sheet, where the sheet contacts the periphery of the lower cutting blade.

Description

[0001]This Nonprovisional application claims priority under 35 U.S.C. ยง 119(a) on Patent Application No(s). JP 2003-174783 and JP 2003-174784 filed in JAPAN on Jun. 19, 2003, the entire contents of which are hereby incorporated by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a method and apparatus for cutting coated sheets. Specifically, the present invention relates to a method and apparatus for cutting coated sheets by passing the coated sheets between opposing discoid cutting blades.[0004]2. Description of the Related Art[0005]Conventionally, there has been known a coated sheet that comprises a sheet substrate such as of paper, film, or resin-coated paper; and a coating layer formed on the sheet substrate, wherein the coating layer is filled with fine particles of silica or the like held together by a resin binder. Such a coated sheet is formed as a web through the steps of applying a liquid coating material to a long ...

Claims

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Application Information

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Patent Type & AuthorityPatents(United States)
IPC IPC(8): B26D1/24B26D7/26
CPCB26D1/245B26D7/2635B26D2001/0053Y10T83/04Y10T83/7813Y10T83/783Y10T83/9403
InventorKAWAI, HIROKAZU
OwnerFUJIFILM CORP